Pickling solution and method for removing residual punching chippings on inner surface of punching part

The invention relates to a pickling solution and a method for removing residual punching chippings on inner surface of a punching part. The pickling solution comprises a solvent, oxalic acid, H2O2 water solution, 98% concentrated sulfuric acid and a surfactant, wherein the volume ratio of the solution to the H2O2 water solution to the 98% concentrated sulfuric acid is 100: 30-50: 5-10; 30-100g ofoxalic acid is added to the solution per 1L; 2-6g of surfactant is added to the solution per 1L; the solvent is deionized water or municipal tap water; the mass content of oxalic acid is not less than99.5%; and the H2O2 water solution comprises 30% by mass of H2O2. The pickling method comprises the processes of preparing the pickling solution and flushing the part. The pickling solution and the method are quick, simple, convenient, and low in cost; the pickling process time is short; the raw materials are easily obtained; the preparation process is simple; and the pickling process is simple. 本发明涉及一种酸洗液及去除冲压零件内表面残留冲压屑的